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US20110268459 TIMING RECOVERY IN PRESENCE OF OPTICAL IMPAIRMENTS AND OPTIMIZATION OF EQUALIZATION BASED ON TIMING RECOVERY MOMENT STRENGTHS  
The present disclosure provides timing recovery in optical systems in the presence of chromatic dispersion (CD), polarization mode dispersion (PMD), and polarization dependent loss (PDL) and to...
US20110052215 Blind Equalization Algorithms for Adaptive Polarization Recovery and PMD Compensation  
A device and method are disclosed for blind equalization of an optical signal to implement adaptive polarization recovery, Polarization Mode Dispersion (PMD) compensation, and residual Chromatic...
US20110318015 AMPLIFIER WITH OFFSET COMPENSATOR AND OPTICAL RECEIVER IMPLEMENTED WITH THE SAME  
An amplifier for an optical receiver is disclosed. The amplifier includes a common base buffer, a differential amplifier, and some buffer amplifiers, where circuit block from the common base...
US20130259492 REDUCING PROCESSING BIAS IN A SOFT FORWARD ERROR CORRECTION (FEC) DECODER  
A system is configured to receive a word that includes a group of samples; randomly select a subset of the samples; identify first samples, from the subset, with a lowest level of reliability;...
US20110142449 Method And Apparatus For Polarization-Division-Multiplexed Optical Coherent Receivers  
The singularity problem of the constant modulus algorithm (CMA) equalizer may be overcome by implementing the CMA equalizer as a two-stage equalizer, with the first stage being a modified version...
US20120281992 SYSTEMS AND METHODS FOR OPTICAL RECEIVER DECISION THRESHOLD OPTIMIZATION  
The present invention provides systems and methods for a receiver threshold optimization loop to provide self-contained automatic adjustment in a compact module, such as a pluggable optical...
US20100080565 Electronic Wavefront Correction for Free-Space Optical Communications  
Systems and methods of electronic wavefront correction are disclosed. An example method receiving an optical signal representing a wavefront traveling along a plurality of propagation paths, and...
US20130084080 COHERENT OPTICAL RECEIVER AND COHERENT OPTICAL RECEIVING METHOD  
A coherent optical receiver according to an exemplary aspect of the present invention includes a coherent optical receiving unit, a first waveform equalizing circuit compensating waveform...
US20130051809 SHORT-TERM OPTICAL RECOVERY SYSTEMS AND METHODS FOR COHERENT OPTICAL RECEIVERS  
The present disclosure provides short-term optical recovery systems and methods in coherent optical receivers to minimize recovery time for fault scenarios and signal reacquisition while...
US20120106982 Coherent optical receiver with adaptive equalizer initialization system  
An adaptive-equalizer initialization system performs three functions: frequency offset estimation, taps estimation for chromatic dispersion filters, and taps initialization for an adaptive...
US20120027404 PHASE NOISE COMPENSATION IN COHERENT OPTICAL COMMUNICATIONS SYSTEMS  
A method (10) of compensating phase noise in a coherent optical communications network. The method comprises: receiving a traffic sample (12); receiving an optical carrier and determining a phase...
US20120281991 OPTICAL RECEIVER COMPENSATING INPUT OFFSET  
A differential amplifier capable of canceling an input offset current and expanding a linearly operating range is disclosed. The differential amplifier, which is preferably applicable to an...
US20090154941 SYSTEMS AND METHODS FOR COMMUNICATION SYSTEM CONTROL UTILIZING CORRECTED FORWARD ERROR CORRECTION ERROR LOCATION IDENTIFIERS  
The present invention provides systems and methods for communication system control utilizing corrected forward error correction (FEC) error location identifiers in multi-level modulation scheme...
US20090202255 ABSTRACT OPTICAL RECEIVER WITH AUTOMATIC DISTORTION CANCELLATION  
An optical receiver includes closed-loop composite second order (CSO) distortion correction logic. An optical communication system includes a transmitter comprising open-loop composite second...
US20150215050 DETECTION AND REMOVAL OF CYCLE SLIP FROM RECEIVED SIGNALS  
Embodiments of the disclosure include a method and apparatus for detecting and removing cycle slip. A phase-modulated signal having a plurality of phase-modulated symbols is received at an optical...
US20140023360 OPTICAL RECEIVING APPARATUS AND CHARACTERISTIC COMPENSATION METHOD  
An optical receiving apparatus includes: a compensator configured to compensate an amount of change in a characteristic; a controller configured to obtain, based on a first amount of change in the...
US20100046961 DISTORTION COMPENSATOR, OPTICAL RECEIVER, DISTORTION COMPENSATOR AND OPTICAL RECEIVER CONTROLLING METHODS, AND OPTICAL TRANSMISSION SYSTEM  
A distortion compensator, an optical receiver and a transmission system including an operation selectively compensating for linear waveform distortion exerted on an optical signal via a plurality...
US20090034989 LIGHT SIGNAL PROCESSING DEVICE AND LIGHT SIGNAL STORING DEVICE  
There is provided a light signal processing device. The light signal processing device includes a label recognition circuit and an electro-absorption optical switch. The label recognition circuit...
US20140161470 SKEW COMPENSATION AND TRACKING IN COMMUNICATIONS SYSTEMS  
Compensation for in-phase (I) and quadrature (Q) timing skew and offset in an optical signal may be achieved based on the correlation between derivatives of I and Q samples in the optical signal....
US20150086221 SELF BIASED DUAL MODE DIFFERENTIAL CMOS TIA FOR 400G FIBER OPTIC LINKS  
A transimpedance amplifier (TIA) device. The device includes a photodiode coupled to a differential TIA with a first and second TIA, which is followed by a Level Shifting/Differential Amplifier...
US20130170842 Method and System for Equalization and Decoding Received Signals Based on High-Order Statistics in Optical Communication Networks  
A method equalizes and decodes a received signal including a sequence of symbols. Subsequences of the signal are selected, wherein the subsequences are overlapping and time shifted. For each...
US20090252505 PHASE-MODULATED SIGNAL RECEIVING DEVICE  
A monitor circuit detects the average light receiving current of a photoelectric conversion device for receiving a positive-phase intensity-modulated signal and outputs the detected current value...
US20110293270 OPTICAL RECEIVER AND OPTICAL TRANSFER APPARATUS  
It is provided an optical receiver comprising a compensator, a compensation controller and a clock extractor. The optical receiver selects first and second values, and obtains a stabilization time...
US20130302041 OPTICAL RECEIVER AND METHOD FOR OPTICAL RECEPTION  
In order to improve degradation of receiving sensitivity caused by analog characteristics degradation in an optical receiver, the optical receiver includes: the first coefficient computing unit...
US20150215049 METHOD FOR ADJUSTING OPTICAL RECEIVER AND APPARATUS FOR ADJUSTING POLARIZATION OF OPTICAL RECEIVER  
An optical receiver is disclosed. The optical receiver includes a polarization holding fiber configured to receive a light emitted from a light source and a polarizer configured to be irradiated...
US20090220244 Demodulation of Phase Modulated Fibre-Optic Sensor System Signals  
Demodulation apparatus for demodulating phase-modulated signals comprises a quadrature signal generator (QSG) for generating in-phase (I) and quadrature-phase (Q) signals in response to an...
US20140086594 OPTICAL RECEIVER HAVING A SIGNAL-EQUALIZATION CAPABILITY  
In one embodiment, an optical receiver has a bulk dispersion compensator and a butterfly equalizer serially connected to one another to perform dispersion-compensation processing and electronic...
US20120002979 Method And Apparatus For Polarization-Division-Multiplexed Optical Receivers  
An optical receiver includes a two-stage constant modulus algorithm (CMA) equalizer. The first stage is a modified version of a CMA equalizer and the second stage is a conventional CMA equalizer....
US20110211847 OPTICAL RECEIVER AND CLOCK GENERATION METHOD  
An optical receiver includes a dispersion mitigator configured to mitigate a wavelength dispersion value in an optical signal by using a set dispersion value, a phase difference signal generator...
US20070264031 BURST MODE OPTICAL RECEIVER  
A system, method, and computer readable medium for burst mode optical receiver that enables an optical receiver to receive signals from a plurality of optical network units at different optical...
US20110052216 Electronic dispersion compensation within optical communications using reconstruction  
Electronic dispersion compensation within optical communications using reconstruction. Within a communication system that includes any optical network portion, segment, or communication link,...
US20130294783 METHOD AND APPARATUS OF ALGORITHM FOR COHERENT RECEIVERS WITH M-QAM MODULATION FORMAT  
An improved Eighth-Order Statistics (EOS) blind phase recovery method is proposed for high-order coherent modulation formats. The method combining EOS blind phase estimate with maximum-likelihood...
US20130101300 POWER ADJUSTMENT OF IN-PHASE AND QUADRATURE COMPONENTS AT A COHERENT OPTICAL RECEIVER  
It is disclosed an optical coherent receiver for an optical communication network. The optical coherent receiver is configured to receive a modulated optical signal and to process it for...
US20150195046 OPTICAL RECEIVER FOR COMPENSATING DC OFFSET  
Disclosed is an optical communication receiver capable of compensating a DC offset while preventing an input load effect. The optical communication receiver includes an optical signal detector; an...
US20100166438 OPTICAL INTERFEROMETER AND OPTICAL RECEIVER  
An optical interferometer includes a substrate; a first and a second branch lines; a third and a fourth branch lines; a first interference portion for causing the first and the third branch lights...
US20050271398 Photo-detector arrangement and process for the calibration thereof  
The circuit offset at any temperature can be calculated from measurements with and without an equivalent substituted load via the new photodetector arrangement in which a switch is added to the...
US20120128377 OPTICAL DIGITAL COHERENT RECEIVER  
An ALC processing unit to adjust the signal level of outputs from an adaptive equalizer to a target value is provided in a stage later than the adaptive equalizer and earlier than a frequency...
US20090279901 PASSIVE COMPONENT FOR ALL-OPTICAL REGENERATION OF HIGH LEVELS BY SATURABLE ABSORPTIONS CAVITY  
An optical component for processing an optical signal, operating by reflection in a saturable absorption resonant cavity formed between a first so-called rear mirror and a second mirror situated...
US20080267638 OPTICAL RECEIVER  
An optical mixing part mixing a received optical signal and local oscillator light in at least two kinds of phases and extracting at least two-system optical signals corresponding to each light...
US20120106983 OPTIMIZED NORMALIZED LEAST MEAN SQUARE PHASE ESTIMATION  
Methods and systems for normalized least mean square phase estimation are shown that include receiving optical transmissions that include a modulated signal, determining a step size based on a...
US20110158658 Optical Subchannel-Based Cyclical Filter Architecture  
The present invention includes novel techniques, apparatus, and systems for optical WDM communications. Tunable lasers are employed to generate respective subcarrier frequencies which represent...
US20130272722 ELECTRONIC COMPENSATION OF NONLINEARITY IN OPTICAL COMMUNICATION  
In various embodiments, electronic apparatus, systems, and methods include electronic compensation of nonlinearity in optical communication. Additional apparatus, systems, and methods are disclosed.
US20120219303 Efficient Computation And Compensation Of Linear And Nonlinear Distortion In Dispersion-Managed Fiber-Opic Transmission  
In one embodiment, a method for performing nonlinearity compensation on a dispersion-managed optical signal that was transmitted over an optical communication link, the method including virtually...
US20090317075 Optical Balanced Receiver and IQ Receiver with Balanced Compensation  
An optical balanced receiver including an optical coupler for combining input optical information signal and optical reference signal and outputting two optical interfering signals whose phases...
US20110150483 APPARATUS, SYSTEMS AND METHODS FOR COMPENSATING INFRARED NOISE IN AN ELECTRONIC SYSTEM  
Remote control signal detection systems and methods are operable to compensate detected infrared energy to identify an infrared energy communication signal emitted by a remote control. An...
US20150071630 NON-LINEAR DISTORTION COMPENSATOR, METHOD OF COMPENSATING NON-LINEAR DISTORTION, AND OPTICAL RECEIVER  
A non-linear distortion compensator includes: a non-linear distortion calculator that calculates non-linear distortion occurred in a received optical signal based on signal information after...
US20120275780 Receivers Based on Closed-Form Parametric Estimates of the Probability Density Function for the Received Signal  
A closed-form parametric approach to channel-estimation is provided. In one aspect, a specific parametric expression is presented for the received signal pdf that accurately models the behavior of...
US20100303459 DISPERSION COMPENSATING APPARATUS, DISPERSION COMPENSATING METHOD, OPTICAL RECEIVING APPARATUS, AND OPTICAL RECEIVING METHOD  
A dispersion compensating apparatus includes a tunable dispersion compensator that dispersion-compensates an optical signal using a group delay property that is asymmetrical in bands outside an...
US20100098411 OPTICAL RECEIVER AND OPTICAL RECEIVING METHOD  
An optical receiver includes a photo-detector that converts a received optical signal into an electric signal and outputs the electric signal, a converter that converts the electric signal into a...
US20070206964 RECEIVER HAVING AN APPARATUS FOR VARYING DECISION THRESHOLD LEVEL AND AN OPTICAL TRANSMISSION SYSTEM HAVING THE SAME  
The disclosure relates to an optical receiver having an apparatus for varying decision threshold level and an optical transmission system having the same. An optical receiver having an apparatus...

Matches 1 - 50 out of 333 1 2 3 4 5 6 7 >